The SimpliVity Data Virtualization Platform (DVP) deduplicates, compresses, and optimizes all data, at inception, once and forever, globally. When sizing a SimpliVity environment we take into account the capacity efficiency provided by the SimpliVity DVP, the effective capacity.
The ratio we use when sizing is a conservative 2.25:1. (1.5:1 Deduplication and 1.5:1 Compression). Our customers typically see much higher efficiency ratios, but we use this conservative ratio for sizing. This is due to the fact that some data may not deduplicate or compress well, for example rich media (video, images, etc). Even when primary data does not deduplicate or compress well the SimpliVity DVP still provides significant savings when it comes to backup and replication.
Here is the general formula I use when sizing for the SimpliVity DVP capacity efficiency:
( Production data + (production data * percent expected growth/100) ) / 2.25 efficiency
For example a customer with 125 TB of data and expected growth of 25%:
( 125 + ( 125 * 25/100 ) ) / 2.25 = ~69.44 TB
In this example I would ensure the SimpliVity environment provided sufficient storage capacity to support 69.44 TB of production data.
Easy enough but what does this look like when deployed in an actual customer environment (or do we see this efficiency for real – on production data).
Here is an example, from an actual customer environment, of SimpliVity DVP efficiency on PRIMARY PRODUCTION DATA:
In this case there is 128.79 TB production data in the environment. The environment consists of approximately 250 virtual machines running workloads including Exchange, SQL, SharePoint, File services, and a number of other application and Web services to support business operations. The physical storage footprint after SimpliVity’s inline deduplication and compression is 30.64 TB, an efficiency ratio of 5.1:1 (3.4:1 deduplication and 1.5:1 compression) before any backups. The capacity savings is 98.15 TB and the entire production environment is hosted on 4 SimpliVity OmniCubes (8 Rack Units!!!) providing N+1 availability for compute and storage.
Since SimpliVity deduplicates and compress data at inception this is also 98.15 TB of IO which was avoided. The real advantage of the SimpliVity DVP is the IO avoidance – not writing duplicate IO. There is approximately 98.15 TB of production data which did not have to be written to disk, a tremendous IO savings. This post is specific to capacity, to learn more about the advantages of IO avoidance SimpliVity provides you must unlearn what you have learned.